Lewis Short
(verb) : prae-monstro (old form praemo-stro
* V.infra), āvi, ātum, 1, , to show beforehand, to point out the way, to guide, direct.
* In gen. (poet.): praemonstra docte, quid fabuletur,Plaut. Pers. 1, 3, 68: currenti spatium praemonstra,Lucr. 6, 93: te praemonstrante,under thy guidance,Stat. Th. 1, 66: praemostro tibi, ut,I caution you, that,Plaut. Trin. 2, 2, 61 Brix ad loc.: quae voluit mihi dixit, docuit et praemonstravit prius,id. ib. 4, 2, 12.
* In partic., to denote beforehand, to predict, presage, prognosticate: magnum aliquid populo Romano praemonstrare et praecinere,Cic. Har. Resp. 10, 21: ventos futuros, id. poët. Div. 1, 7, 13: hanc suavitatem praemonstratam efficaci auspicio,Plin. 10, 29, 43, § 82.
Charlton T. Lewis, Charles Short, A Latin Dictionary